Murder of Innocence ID True Crime, Book 5 [Audiobook]

Murder of Innocence: It's impossible to resist Andrew Luster. He's rich, charming, and good-looking, and dozens of women have fallen under his spell. But Andrew is no mere womanizer. He's a predator, and it'll take a global effort to put him behind bars. (With Max DiLallo.)
A Murderous Affair: Mark Putnam is a rookie FBI agent given his first assignment in a remote part of Kentucky, a land of coal miners and meth dealers. Within his first months on the job, a young female informant named Susan Smith helps him make a big break in an important case. Rumors begin circulating that the agent and his informant are having an affair. After Susan starts telling people that she is pregnant with the FBI agent's baby, she suddenly disappears. (with Andrew Bourelle)